It's funny that spot was natural like that on the statues. I didnt layer the sky at all, I thought that was weird too. I am noticing a lot of noise right from Photomatix, out of the box. I shot this today and didn't go as far on my bracketing to try and compensate, still noise. So i was reading and I took the HDR image in CS3, layer the HDR over the darkest single exposure and use the white eraser to blend some of that back in. It helped a good bit with the noise, but it took some of the "HDR" out of the shot.
I know one issue is that I have a Canon 40D and it is limited to 3 shot bracketing. I have read where some are using 5, 7, 9, 14 exposures, throwing out the really dark exposures to avoid the noise.
I know what you are saying about the adjustment tools I get in Photomatix, but it seems those tools also take care of the noise but also take a lot of what I like about the photo out too, the "HDR-ness". So I am stuck between a rock and a hard place, do I deal with the noise but get the effect I like, or do I get less effect and less noise?
One resolution to the problem is getting a 5D MarkII

Wonder if the wife will go for that

